Digital Commons Network^™

Application Of The Variational Fracture Model To Hydraulic Fracturing In Poroelastic Media, Chukwudi Chukwudozie

LSU Doctoral Dissertations

Hydraulic fracturing has persisted through the use of simple numerical models to describe fracture geometry and propagation. Field tests provide evidence of interaction and merging of multiple fractures, complex fracture geometry and propagation paths. These complicated behaviors suggest that the simple models are incapable of serving as predictive tools for treatment designs. In addition, other commonly used models are designed without considering poroelastic effects even though a propagating hydraulic fracture induces deformation of the surrounding porous media. A rigorous hydraulic fracturing model capable of reproducing realistic fracture behaviors should couple rock deformation, fracture propagation and fluid flow in the both …

Study Of Resistivity And Shear Wave Velocity As A Predictive Tool Of Sediment Type In Levee Foundation Soils, Louisiana Gulf Coast Levee System, Derek Stephen Goff

LSU Master's Theses

Geotechnical sediment type of levee foundation soils may be estimated by using cross-plots of shear-wave velocity and electrical resistivity for Louisiana levees. Best-fit polynomial models for estimating soil type in Japanese levees have been created using cross-plots of shear-wave velocity and electrical resistivity. A similar study or model for flood protection structures in the Mississippi River delta plain or other major river delta does not exist. We make the soil-type estimation model more relevant to the foundation soils in the Louisiana Coastal Zone by identifying silt in addition to sand and clay, and eliminating gravel as a dominant soil type. …

Retention Of Institutional Memory Via Knowledge Management: Perceptions Regarding The Effectiveness Of Corporate Approaches Applied In Higher Education, Sonya Yvette Marsh

LSU Doctoral Dissertations

Research has shown that private industry has a better grasp on knowledge management concepts and practices than in the higher education arena. Given the internal and external challenges facing colleges and universities, the processes and systems associated with knowledge management could serve as a resource for performance improvement and greater levels of effectiveness and efficiency. This phenomenological study was conducted to determine the perceptions and perspectives of deans regarding the usefulness and value of implementing knowledge management best practices typically employed by organizations in the private sector. Four research questions guided this study: 1) What level of awareness exists of …

Toward An Advanced System Of Accountability For Improved Student Learning Outcomes: A Mixed-Methods Analysis Of Test-Based Accountability In Louisiana, Susan Nicole Kahn

LSU Doctoral Dissertations

The nature of federal and state policies regarding accountability testing narrows the taught curriculum to content tested, thereby changing what is officially valued as student learning. The over-emphasis on standardized test scores has narrowed the curriculum to content that is tested (Amrein & Berliner, 2002; Baker, 2008; Herman, 2008; Koretz & Hamilton, 2003; Linn, 2000). In Louisiana, test-based accountability defines local school quality through a letter grade rating scale that uses an index for school performance scores (SPS), which in turn impacts traditional and nontraditional (e.g. charter) school expansion, closure, and takeover, administration of opportunity scholarships (e.g. voucher) for private …

Effects Of Landscape Fragmentation On Land Loss, Weijia Cheng

LSU Master's Theses

Coastal Louisiana, the seventh largest delta on earth, is one of the most vulnerable coastal areas in the United States of America (USA) because of its land loss problem. Coastal land loss is usually caused by many complicated factors. With the rapid increase in human activities, more studies on land loss have focused on the anthropogenic elements, but less on the pattern of the landscape. It is expected that the type of spatial arrangement, such as high degree of fragmentation, would affect the degree of land erosion. A quantitative evaluation of coastal landscape fragmentation and its influences on land loss …

Analysis And Management Of The Price Volatility In The Construction Industry, Alireza Joukar

LSU Doctoral Dissertations

The problem of price volatility as it pertains to material and labor is a major source of risk and financial distress for all the participants in the construction industry. The overarching goal of this dissertation is to address this problem from both viewpoints of risk analysis and risk management. This dissertation offers three independent papers addressing this goal. In the first paper using the Engineering News Record Construction Cost Index (ENR CCI), a predictive model is developed. The model uses General Autoregressive Conditional Heteroscedastic (GARCH) approach which facilitates both forecasting of the future values of the CCI, and capturing and …

Curriculum And Compassion: An Inquiry Into The Relevance Of The Charism Of The Brothers Of The Sacred Heart In A Post-Modern World, Thomas Walter Eldringhoff

LSU Doctoral Dissertations

The purpose of this study is to examine the relevance of a curriculum that embodies the charism of the Brothers of the Sacred Heart in a post-modern world. The project will investigate the understanding of the charism both by the researcher and by selected brothers who are in unique positions to articulate and explicate just what the charism entails. A variety of formational and foundational documents will also be subjected to philosophical analysis so a deep picture of the charism is available to the reader. Literature surrounding post-modernist curriculum theory serves as the theoretical framework for this investigation of the …

Ultrafast And Nonlinear Spectroscopy Of Colloidal Nanomaterials, Tony Eugene Karam

LSU Doctoral Dissertations

In the first part of this dissertation, the adsorption isotherms, resonance coupling, and fluorescence of molecular dyes on the surface of plasmonic nanoparticles are investigates. SHG is also used to investigate the growth of a silver shell on the surface of gold nanoparticles in real time. Additionally, gold-silver-gold core-shell-shell nanoparticles possess extinction peak wavelengths that can be controlled over the visible and near-infrared regions and enhanced photothermal effect. Transient absorption measurements determine that the phonon-phonon scattering lifetime is considerably faster in the core-shell-shell nanoparticles than in the gold nanospheres and gold nanorods, which contributes to the higher photothermal efficiencies. Transient …

The Effect Of An 8-Minute Yoga Breathing Program On Fitness, Weight Loss And Breathing Capacity, Jerrold S. Petrofsky, Michael S. Laymon, Iman Akef Khowailed, Haneul Lee, Allie Petrofsky

College of Health & Human Services (TUN) Publications and Research

This was a single blinded randomized study with an intervention group and a control group to examine a modification in lifestyle and an 8-minute exercise session each day to lose weight. Fifty-seven female subjects participated. Subjects underwent girth measurements at the umbilicus, hips, thigh and upper arm; weight, height (for BMI), body fat, heart rate, blood pressure, abdominal strength, leg strength, arm strength, sedentary O2 saturation, treadmill challenged O2 saturation, resting metabolism (which includes fat metabolism), and lung capacity. Measures were repeated at baseline and the end of the 6-week period. During the 6-week period, they followed a healthy recommended …

Preface, Desmond H. Murray

Faculty Publications

No abstract provided.

A Highly Sensitive Underwater Video System For Use In Turbid Aquaculture Ponds, Chin-Chang Hung, Shih-Chieh Tsao, Kuo-Hao Huang, Jia-Pu Jang, Hsu-Kuang Chang, Fred C. Dobbs

OES Faculty Publications

The turbid, low-light waters characteristic of aquaculture ponds have made it difficult or impossible for previous video cameras to provide clear imagery of the ponds' benthic habitat. We developed a highly sensitive, underwater video system (UVS) for this particular application and tested it in shrimp ponds having turbidities typical of those in southern Taiwan. The system's high-quality video stream and images, together with its camera capacity (up to nine cameras), permit in situ observations of shrimp feeding behavior, shrimp size and internal anatomy, and organic matter residues on pond sediments. The UVS can operate continuously and be focused remotely, a …

Growth Conditions For Uniqueness Of Smooth Positive Solutions To An Elliptic Model, Joon Hyuk Kang

Faculty Publications

The uniqueness of positive solution to the elliptic model

∆u + u[a + g(u, v)] = 0 in Ω, ∆v + v[a + h(u, v)] = 0 in Ω, u = v = 0 on ∂Ω,

were investigated.

The Relationship Between Successful Completion And Sequential Movement In Self-Paced Distance Courses, Janine M. Lim

Faculty Publications

A course design question for self-paced courses includes whether or not technological measures should be used in course design to force students to follow the sequence intended by the course author. This study examined learner behavior to understand whether the sequence of student assignment submissions in a self-paced distance course is related to successful completion of the course. The study included 543 students in 89 different general education courses at a private university in the United States during a two year period. Results indicate that students who completed at least one assignment or exam out of the intended sequence of …

Curriculum Change 2016-2017, Portland State University

Bulletin & Curriculum Change Documents

No abstract provided.

The Language Of Professional Development Leaders, Andrew Riffel, Kathleen Mary Melhuish, Eva Thanheiser

Mathematics and Statistics Faculty Publications and Presentations

Leaders in professional development (PD) initiatives (such as facilitators, principals, coaches) hold a great deal of power in their language, carrying the ability to manage meaning and frame experiences. Rather than working from interview data, this report addresses a gap in leadership research by examining the words used by leaders in their on-the-job interactions. We present an initial framework for capturing leadership language qualities at the macro level (framing the PD’s purpose) and micro level (rhetorical crafting in terms of metaphor usage, pronoun choice, and other language selections). Our data come from a larger project evaluating the efficacy of a …

Greater Number Of Larger Pieces: A Strategy To Promote Prospective Teachers’ Fraction Number Sense Development, Dana Olanoff, Ziv Feldman, Rachael M. Welder, Jennifer M. Tobias, Eva Thanheiser, Amy F. Hillen

Mathematics and Statistics Faculty Publications and Presentations

Prospective teachers (PTs) need opportunities to develop fraction number sense, yet little research has explicated how this development occurs. Our research team collaboratively designed a task targeted at helping PTs develop fraction number sense through an exploration of fraction comparison strategies. This paper focuses on developing one particular strategy, which we call Greater Number of Larger Pieces (GLP). We argue that understanding this strategy has the potential to support PTs’ number sense, particularly in regards to the measure interpretation of fractions. Analysis of data from two iterations of this task (implemented by five mathematics teacher educators at five US institutions …

Landmark Based Shape Analysis For Cerebellar Ataxia Classification And Cerebellar Atrophy Pattern Visualization, Zhen Yang, S. Mazdak Abulnaga, Aaron Carass, Bruno Jedynak, Chiadi U. Onyike, Jerry L. Prince, Multiple Additional Authors

Mathematics and Statistics Faculty Publications and Presentations

Cerebellar dysfunction can lead to a wide range of movement disorders. Studying the cerebellar atrophy pattern associated with different cerebellar disease types can potentially help in diagnosis, prognosis, and treatment planning. In this paper, we present a landmark based shape analysis pipeline to classify healthy control and different ataxia types and to visualize the characteristic cerebellar atrophy patterns associated with different types. A highly informative feature representation of the cerebellar structure is constructed by extracting dense homologous landmarks on the boundary surfaces of cerebellar sub-structures. A diagnosis group classifier based on this representation is built using partial least square dimension …

The Pathology Of Command And Control: A Formal Synthesis, Michael Cox

Dartmouth Scholarship

One of the most important theories in the study of environmental governance and policy is the pathology of command and control, which describes the negative consequences of top-down, technocratic governance of social and ecological systems. However, to date, this theory has been expressed somewhat inconsistently and informally in the literature, even by the seminal works that have established its importance and popularized it. This presents a problem for the sustainability science community if it cannot be sure of the precise details of one of its most important theories. Without such precision, applications and tests of various elements of the theory …

Seasonal Habitat Selection Of The North American Porcupine (Erethizon Dorsatum) In A Coastal Dune Forest, Cara L. Appel

Cal Poly Humboldt theses and projects

Wildlife-habitat relationship studies are important for understanding the factors that determine where species occur in space and time. Habitat selection by generalist species should be studied on fine spatial and temporal scales to avoid masking important differences between seasons, localities, or orders of selection. I conducted the first study of habitat use and general ecology of North American porcupines (Erethizon dorsatum) in a coastal dune environment. Specifically, I assessed changes in body mass, home range size, and habitat selection in relation to the potential for seasonal nutritional and survival bottlenecks as reported elsewhere. Although they are considered generalists, …

Simulation Of Nuclear Fusion Using A One Dimensional Particle In Cell Method, Steven T. Margell

Cal Poly Humboldt theses and projects

In this thesis several novel techniques are developed to simulate fusion events in an isotropic, electrostatic three-dimensional Deuterium-Tritium plasma. These techniques allow us to accurately predict three-dimensional collision events with a one-dimensional model while simultaneously reducing compute time via a nearest neighbor algorithm. Furthermore, a fusion model based on first principles is developed that yields an average fusion reactivity which correlates well with empirical results.

Juvenile Survival And Adult Return As A Function Of Freshwater Rearing Life History For Coho Salmon In The Klamath River Basin, Molly Gorman

Cal Poly Humboldt theses and projects

The Scott and Shasta rivers, Klamath River tributaries, experience spatial disparity in habitat quality in spring and summer as a result of historical and current land-use. Juvenile Coho Salmon (Oncorhynchus kisutch) born in the upper tributary reaches often rear in natal streams before migrating to sea. However, those born in the lower reaches often encounter unsuitable habitat and emigrate during their first spring to seek non-natal rearing habitats. It is assumed that these early outmigrants are population losses. This study evaluated first-summer survival, and contribution to the adult population, of non-natal rearing juveniles in the Klamath River Basin. …

The Influence Of Enrollment In Career And Technical Education Courses On The Achievement Of High School Special Education Students, Melinda Simoneaux Partin

LSU Doctoral Dissertations

This dissertation joins a conversation in the special education arena about the academic and vocational agenda for special education high school students. It explores the influence of enrollment in Career Technical Education (CTE) courses on the achievement of high school special education (SPED) students. The purpose of this study was to compare the achievement of special education (SPED) students enrolled in Career Technical Education (CTE) courses with special education (SPED) students who were not enrolled in Career Technical Education (CTE) courses. The study was designed to determine whether or not SPED students enrolled in CTE improved on the academic scores …

Application Of Biomass Derived Materials In Nanocomposites And Drilling Fluids, Kunlin Song

LSU Doctoral Dissertations

Tar is inevitably produced from biomass thermochemical processes, and is often disposed as an industrial waste, leading to environmental pollution. As a result of its high carbon content, tar was expected to be a promising precursor for manufacturing carbon materials. Consequently, low-cost porous carbon nanofibers (CNFs) using tar, polyacrylonitrile (PAN), and silver nanoparticles was fabricated through electrospinning and subsequent stabilization and carbonization processes. The continuous electrospun nanofibers were obtained with diameters ranging from 392 to 903 nm. The addition of biomass tar resulted in increased fiber diameters, reduced thermal stabilities, and slowed cyclization reactions of PAN in the as-spun nanofibers. …

Analysis Of Disruptions In The Gulf Of Mexico Oil And Gas Industry Supply Chain And Related Economic Impacts, Negar Dahitaleghani

LSU Doctoral Dissertations

Catastrophic events are human and economic tragedies in collaboration. Oil spills have enormous impacts on the local economy of the area and for the local labor markets. The Deepwater Horizon oil spill was caused by an explosion on semisubmersible drilling rig (Macondo) on April 20, 2010. Another regional disaster, Hurricane Katrina as it ripped over the core of the Gulf of Mexico producing zone, one of the most important oil and gas production region. With Geological complexities, continued of drilling and production in GoM increases the risk of having leak/spill. Therefore, the Econometrics methods, and Modeling to forecast impacts of …

Structure And Dynamics Of Layered Transition Metal Compounds Driven By Broken Symmetry, Chen Chen

LSU Doctoral Dissertations

Correlated Electron Systems have attracted attention because of their complex phase diagrams that often contain several exotic phases that cannot be understood at all with traditional ideas. This is driven by the competition between many low-lying states, competing to be the ground state. That means by tuning parameters like temperature, pressure, magnetic _x000C_field, or doping concentration, one phase would be suppressed and another emerges. These phases are in such a delicate balance that they compete and interact with each other, and experimentally we can always find a way to alter this balance. In this work, two systems have been investigated: …

“Law &” Meets “Law As”, Linda L. Berger

Scholarly Works

Prof. Berger reviews The Handbook of Law and Society, edited by Austin Sarat and Patrick Ewick.

The Vulnerability Of Louisiana To Hurricane Damage And The Value Of Wetlands For Hurricane Risk Reduction, James Luke Boutwell

LSU Doctoral Dissertations

Coastal Louisiana is annually threatened by coastal storms. Population grown, wetland loss, and potentially increasing storm frequency are likely to increase coastal vulnerability to these events. Increasingly, coastal management entities are managing land resources to reduce the economic impact of natural disasters with the use of natural infrastructure. This is true in Louisiana where the Louisiana Coastal Master Plan allocates billions of dollars to coastal restoration projects, many of which are intended to mitigate economic damages from tropical storms and hurricanes. Despite this significant proposed investment, the risk reduction value provided by these projects is not well known. This analysis …

Studies Of The Properties Of Designed Nanoparticles Using Atomic Force Microscopy, Steve Matthew Deese

LSU Doctoral Dissertations

The purpose of the research in this dissertation was to elucidate the intrinsic properties of how nanoparticles are different from bulk materials. This was done by mechanical and electronic studies of the properties of designed nanoparticles using advanced modes of atomic force microscopy. Information relating to the work functions, contact potential difference, Young’s Moduli, elasticity, and viscoelasticity can be investigated using state-of-the-art atomic force microscope (AFM) experiments. Subsurface imaging of polystyrene encapsulated cobalt nanoparticles was achieved for the first time using Force Modulation Microscopy (FMM) in conjunction with contact mode AFM. Previously prepared sample of polystyrene coated cobalt nanoparticles were …

Integration Of Optical Remote Sensor-Based Yield Prediction And Impact Of Nitrogen Fertilization, Harvest Date, And Planting Scheme On Yield, Quality, And Biomass Chemical Composition In Energy Cane Production In Louisiana, Marilyn Sebial Dalen

LSU Doctoral Dissertations

The established sugarcane industry in Louisiana is perceived as an advantage for biofuel industry because of the similarities of energy cane and sugarcane by way they are cultivated, harvested, and processed. This study was conducted at the LSU AgCenter Sugar Research Station in St. Gabriel, LA from 2013-2015 to evaluate the influence of planting scheme, N rate, and harvest date on energy cane yield, quality parameters, nutrient uptake, and biomass chemical composition. The relationship of vegetation indices (VI) with stalk, fiber yield, and N uptake of energy cane harvested at different dates was also evaluated. The experiments consisted of variety …

Fundamental Studies Of Humic Acid's Influence On Pollutant Toxicity To Aquatic Organisms, Rachel Dawn Deese

LSU Doctoral Dissertations

The main purpose of the research presented in this dissertation was to further understand the intricate and convoluted interactions between natural organic material, biological entities, and pollutants. This was achieved by utilizing humic acids (HAs) from differing sources, chemically modified humic acid, two biological entities (model biomembranes and Artemia Franciscana), and three types of pollutants (cations, surfactants, and carbon nanotubes). Fluorescence spectroscopy and model biomembranes were used to measure the change in HA’s ability to interact with the biomembranes in the presence of cations. Three differently sourced HAs, chemical modified HAs, and a range of cations were studied to elucidate …